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Debt - Term Loans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 12, 2017
Dec. 31, 2019
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]              
Loss on extinguishment of debt         $ 0 $ 0 $ 673
Minimum assets trigger         300    
Minimum amount in excess of indebtedness trigger         300    
Interest expense related to the Term Loan         1,519 1,494 $ 1,206
2017 Term Loans              
Line of Credit Facility [Line Items]              
Term loan facility $ 21,000 $ 18,200     $ 18,200 $ 21,000  
Loss on extinguishment of debt       $ 700      
Debt issuance costs, line of credit arrangements (less than) $ 100            
Interest rate per annum         4.00%    
Final payment fee (as a percent)         5.00%    
Final payment fee   1,100     $ 1,100    
Debt instrument, basis spread on variable rate         100.00%    
Interest expense related to the Term Loan   $ 1,500 $ 1,500 $ 1,200      
2017 Term Loans | Base Rate              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate 0.05%            
2017 Term Loans | Outstanding Balances              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate         105.00%    
2017 Term Loans | Prepaid after second anniversary              
Line of Credit Facility [Line Items]              
Prepayment fee (as a percent)   1.00%     1.00%    
Term Loans              
Line of Credit Facility [Line Items]              
Repayments of debt $ 10,000